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On Tuesday, California's Supreme Court upheld a ban against same-sex marriages that voters passed in November, but also ruled that about 18,000 same-sex marriages performed before the ban would remain valid. See which other states recognize same-sex unions »

Same-sex marriages are legal in four states -- Connecticut, Iowa, Maine and Massachusetts.

Vermont's Legislature has passed a bill that will legalize same-sex marriages starting in September.

The District of Columbia voted May 5 to recognize same-sex marriages performed elsewhere, though it does not itself give marriage licenses to same-sex couples.